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Cross-contamination between raw materials is most damaging when the contaminant is

  • A.an iron-bearing mineral in a white body
  • B.a second clay of a broadly similar overall composition
  • C.a coarser grade of the very same quartz
  • D.a small quantity of the same feldspar

Answer: A

Iron shows as a dark speck or a discoloured glaze at concentrations far too low to affect any other property, so the tolerance is very much tighter than for the other three. Dedicated plant for white bodies follows directly.

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